page_title: Iona Island (New York)
section_title: Geography
hierarchical_section_title: Iona Island (New York) / Geography
caption_attribution_description: English: Iona Island in the Hudson River, Rockland County, New York. On the other side of the river is Westchester County. Aerial view looking northeast.
context_page_description: Iona Island is a 556-acre island of the Hudson River in the town of Stony Point, New York, on its west bank. The island is located approximately one mile south of the Bear Mountain Bridge and is separated from the Hudson's western shore by mudflats and freshwater tidal marshes. It is part of Bear Mountain State Park, although it is occasionally listed separately as Iona Island State Park. From 1899 to 1947 the island was used as the Naval Ammunition Depot Iona Island.
  The island and its adjacent marsh were designated a National Natural Landmark in May 1974, and it is part of the Hudson River National Estuarine Research Reserve. It serves mainly as a bird sanctuary, particularly known as a winter nesting place for bald eagles.
context_section_description: Iona Island is transected by active River Subdivision (CSX Transportation) railroad tracks, but is accessible to the public only by a causeway connecting it to U.S. Route 9W in Bear Mountain State Park, near Doodletown. It is maintained by the Palisades Interstate Park Commission.
  The southeastern part of the island, once cut off by marshes, is known as Round Island. It was attached to the south end of bedrock Iona Island with fill in the early 20th century. The hill on the western side, south of the causeway, was also once treated as separate, and referred to as Courtland Island. Snake Hole Creek originates in the low marshes towards the center of the island and flows southwesterly, then turning to the southeast and finally east in a long crescent to reach the Hudson. It separates the marshes of Salisbury Meadow, on the west side, from Ring Meadow, on the east side.
caption: Aerial view of Iona Island in the brown waters of the Hudson, looking northeast
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